If your girlfriend is pregnant and emotional, you may not know how to deal with her mood swings. You most likely love her with all your heart and want the best for her, but you may not know how to be supportive. It is essential that you keep the love you have with your partner alive during pregnancy, according to Heidi Murkoff, author of "What to Expect When You're Expecting." The relationship you enjoy with your girlfriend will only improve during pregnancy if you learn to be supportive of her emotions.

Stick by Her Side

Being there for your girlfriend through all of her emotional and bodily changes will show her that you support her through everything. You should accompany her to her prenatal appointments when possible, according to the Child Welfare Information Gateway. You will be able to hear your baby's heartbeat, see your baby on ultrasound and perhaps even discover the gender. Your girlfriend may not be as emotional when she knows that you are going to be there for her during all the changes pregnancy brings.

Pregnancy Pampering

Just doing something small for your girlfriend, such as offering to buy her a massage or getting her a favorite treat, will help calm her emotions. A prenatal massage may help stabilize hormone levels that lead to mood swings or relieve depression and anxiety, according to "Massage" magazine. It will also help take away stress on her joints caused by the extra weight she is carrying around.

Encourage Some R and R

Let your girlfriend know that it is important for her to relax during this vulnerable time in her life. She is doing something very special by carrying a baby and will need all the extra energy she can get. You may encourage rest by helping out with the household chores, according to the Child Welfare Information Gateway. It will be easier for her to control her emotions when she has a clearer perspective, and getting the rest she needs will help her body as well as her mind.

Forgive and Forget

If your girlfriend says something hurtful to you during her pregnancy, it is essential that you forgive her. She is going through many transitions -- both in her body and her mind. Perhaps she is nervous about all the new responsibilities she will have with a baby, especially if this is her first pregnancy. She might be swollen and exhausted. If you hold a grudge against her, she will only become more stressed out. Instead, let go of any anger you experience over something careless she said Embrace her and let her know you will be there for her all the way.